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Deepwater carbonate ion concentrations in the western tropical Pacific since 250ka: Evidence for oceanic carbon storage and global climate influence
Qin, Bingbin1,3; Li, Tiegang2,3,4; Xiong, Zhifang1,2,4; Algeo, Thomas J.5,6; Chang, Fengming1,4
2017-04-01
Source PublicationPALEOCEANOGRAPHY
Volume32Issue:4Pages:351-370
SubtypeArticle
AbstractWe present new size-normalized weight (SNW)-[CO32-] core-top calibrations for three planktonic foraminiferal species and assess their reliability as a paleo-alkalinity proxy. SNWs of Globigerina sacculifer and Neogloboquadrina dutertrei can be used to reconstruct past deep Pacific [CO32-], whereas SNWs of Pulleniatina obliquiloculata are controlled by additional environmental factors. Based on this methodological advance, we reconstruct SNW-based deepwater [CO32-] for core WP7 from the western tropical Pacific since 250ka. Secular variation in the SNW proxy documents little change in deep Pacific [CO32-] between the Last Glacial Maximum and the Holocene. Further back in time, deepwater [CO32-] shows long-term increases from marine isotope stage (MIS) 5e to MIS 3 and from early MIS 7 to late MIS 6, consistent with the coral reef hypothesis that the deep Pacific Ocean carbonate system responded to declining shelf carbonate production during these two intervals. During deglaciations, we have evidence of [CO32-] peaks coincident with Terminations 2 and 3, which suggests that a breakdown of oceanic vertical stratification drove a net transfer of CO2 from the ocean to the atmosphere, causing spikes in carbonate preservation (i.e., the deglacial ventilation hypothesis). During MIS 4, a transient decline in SNW-based [CO32-], along with other reported [CO32-] and/or dissolution records, implies that increased deep-ocean carbon storage resulted in a global carbonate dissolution event. These findings provide new insights into the role of the deep Pacific in the global carbon cycle during the late Quaternary.
KeywordShell Weight Planktonic Foraminifera Proxy Calibration Carbonate Chemistry Coral Reef Hypothesis Ocean Stratification
DOI10.1002/2016PA003039
Indexed BySCI
Language英语
WOS IDWOS:000401142500002
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136864
Collection海洋地质与环境重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
2.State Ocean Adm, Inst Oceanog 1, Qingdao, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
5.China Univ Geosci, State Key Labs BGEG & GPMR, Wuhan, Peoples R China
6.Univ Cincinnati, Dept Geol, Cincinnati, OH USA
First Author Affilication中国科学院海洋研究所
Recommended Citation
GB/T 7714
Qin, Bingbin,Li, Tiegang,Xiong, Zhifang,et al. Deepwater carbonate ion concentrations in the western tropical Pacific since 250ka: Evidence for oceanic carbon storage and global climate influence[J]. PALEOCEANOGRAPHY,2017,32(4):351-370.
APA Qin, Bingbin,Li, Tiegang,Xiong, Zhifang,Algeo, Thomas J.,&Chang, Fengming.(2017).Deepwater carbonate ion concentrations in the western tropical Pacific since 250ka: Evidence for oceanic carbon storage and global climate influence.PALEOCEANOGRAPHY,32(4),351-370.
MLA Qin, Bingbin,et al."Deepwater carbonate ion concentrations in the western tropical Pacific since 250ka: Evidence for oceanic carbon storage and global climate influence".PALEOCEANOGRAPHY 32.4(2017):351-370.
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